Normal mccarty



(No Model.)

N. MGOARTY.

ELECTRIC ARC LAMP.

No 325,428. Patented Sept. 1, 1885.

I I flif w I M M flea/w N. FUER'S. Photo-Uhographer, Waihlngfon. n. c.

UNITED STATES PATENT OFFICE.

NORMAN MCCARTY, OF HOOSIGK, NEWV YORK, ASSIGNOR TO JOHN B. TIBBITS, OFSAME PLACE.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 325,423, datedSeptember 1,1885.

Application filed June 1, 1885.

T aZZ whmn it ntay concern:

Be it known that I, NORMAN MOOARTY, of

V Hoosick, in the county of Rensselzfr and State of New York, haveinvented a new Improvement in Electric-Arc Lamps; and I do herebydeclare the following, when taken in con nection with accompanyingdrawings, and the letters of reference marked thereon, to be a full,clear, and exact description of the same, to and which said drawingsconstitute part of this specification, and represent, in Figure 1, asideView of the principal magnet, carbon-holders, the shuntrmagnet, and itsmechanism; Fig. 2, an enlarged side view ofthe armature and contacts ofthe shunt-magnet,

showing the armature in the position of permitting one contact to closebefore the other is opened; Fig. 3, top View of the armaturearms,showing the connection with the respect- 2o ive contact-spindles.

This invention relates to an improvement in electricarc lamps in which ashunt-magnet is employed arranged to break the circuit through one lineafter it is completed through another, and is an improvement upon theinvention for which. Letters Patent of the United States No. 305,096were granted to me September 16, 1884. In that invention movablecontacts were provided for making and breaking the circuit through theshunt, the contacts following the armaturelever to such an extent that acontact was made at one point before it was broken at the other. Whilethat device accomplishes the object of the invention, it

3 5 makes the shunting apparatus somewhat complex.

The object of my present invention is to simplify the shunt mechanism;and it consists in the construction, as hereinafter described, and

more particularly recited in the claims.

For convenience of illustration, I show the principal magnet, the shunt,and the carbons detached from the usual lamp mechanism, and not in theirusual relation to each other.

A represents the principal magnet; B, the shunt magnet, O, theuppercarbon holder, and D the lower-carbon holder; at, the armature ofthe principal magnet, and b the armature of the shunt-magnet, hinged toproduce a vibratory movement in the breaking and closing of (S0 modelthe circuit, substantially the same as in my previous patent.

To the armature b of the sh tint-magnet a bar forming two arms, 0 d, isrigidly attached, the one extending in one direction from the arlnatureand in the plane of vibration of the armature, and the other in theopposite direction, as seen in Fig. 3, and so that as the armature turnsin its opening and closing movement the bar cd turns accordinglysay, asfrom the position seen in Fig. 1, open, to that seen in broken lines,same figure, closed, and return.

E is one fixed contact block or point for the shunt, and F the otherblock or contact. Over the block E is a vertical spindle, G, carrying acontact, H, and over the block F is a like spindle, I, carrying alikecontact, J. The spindles both extend upward through a supporting-bar, K,and so that they are held in line with their respective contact-blocks,but so that they may be moved up or down to make or break the contact.

The spindle G is constructed with a vertical slot, e, through which apin, f, in the arm 0 extends, and the other spindle, I, is constructedwith a like vertical slot, 9, through which a pin, h, in the leverextends, as seen in Figs. 3 and 4. These slots are in such re lation toeach other and to the respective studs that at an intermediate point inthe movement of the armature both contacts H J may rest upon theirrespective contacts E F, as seen in Fig. 2, but when the armature is inthe open position, as seen in Fig. 1., then the contact H is free torest upon its contact E, but the other contact, J, will be raised fromits contact, as seen in that same figure. On the contrary,when thearmature is fully closed, as indicated in broken lines, Fig. 1, then thecondition is reversed, and the contact J will rest upon its contact F,while the contact H will be raised frornits contact E. The contacts Hand J fall by their own gravity, and are simply lifted or raised by theturning of the armature. The incoming line L is in connection with orattached to both the spindles I G, as indicated in Fig. 1, and the sameline also connects with one end of the coil of the shunt-magnet. Fromthe contact F of the shunt apparatus a line, t, leads to the uppercarbonholder, and from one end of the coil of the principal magnet A a line,Z, also extends to the same upper-carbon holder. From the other contact,E, a line, m, extends to the other end of the principal magnet-coil.From the lower-carbon holder a line, M, leads to the next lamp, and fromthe other end ofthe shuntcoil 21 line, a, leads to the same lower-carbonholder. This arrangement of linesis substantially the same as that in myprevious patent.

The shunt-armature being open, contact is made between H and E, and thecircuit is through the principal magnet, and the carbons burn in theusual manner. As the carbons are consumed and the I are therebyincreases, a portion of the current will be shunted through the wire a,that current gradually increasing as the are increases until the currentshunted be strong enough to overcome the springN of the shunt-armature.Then that armature will be drawn toward its pole, and as it approachesits pole, as seen in Fig. 2, the contact J will be brought upon itsblock F, as seen in that figure, and make contact therewith before thep111 f has reached the upper end of the slot 6 in the spindle G of theother contact, H. Then asthe current through the sh unt still increasesto draw the armature to its closed position, (indicatedin broken1incs,FigS. l and 2,) the other contact, II, will be raised from itsblock to break the contact between H and E. In this condition thecurrent is shunted from the principal magnet A, breaking the circuitthrough that magnet, the feeding of the carbons takes place in the usualmanner, the are is restored. Then the shunt-magnet loses its power inthe usual manner, the armature opens, and in such movement permits thecontact H to drop and make engagement with the contact E before thecontact J shall be raised from its contact F; and then in the finalopening movement of the shunt-armature the contact J will be raised tobreak its conncction from its contact E, and so will continue to act. Asthe carbons are consumed and the are increases,theshunt-armature will bebrought into action to operate its contacts H J; but in all cases thecontacts at one side are brought together before the other contacts arebroken. Therefore the circuit through the main line cannot be brokenbefore it is completed through the shunt, or vice versa; but the maincurrent may be gradually broken before the feeding of the carbon takesplace, as in my previous patent.

I have represented the contacts II E and J 1? as presenting flat faces,and this I prefer; but the shape of those contacis is immaterial to myinvention. The contacts thus arranged require no spring to cause them tofollow the movement of the armature, the downward or closing moyementbeing made entirely by gravity and the opening movement by the movementof the armature directly.

I have not illustrated the feeding mechanism for the carbons or anyparticular arrangement of the principal and shunt magnets, as suchconstitutes no part of my invention and is immaterial to it.

I have represented the slots for the loose connection between the armsand the respect ive contacts H J as made in the spindles carrying thecontacts, with the pin in the arm; but this order may be reversed, itonly being essential that there shall be such a loose coir nectionbetween the two contacts and the respective arms that sufficient playwill be allowed between the arms and the contacts that one contact mayrest upon its block before the other contact shall have been lifted fromits block.

I claim 1. The combination of the principal magnet and .theshunt-magnet, the armature of the shunt-magnet hinged to produce avibratory movement in breaking and closing the main circuit, two armsextending from said armature in the direction of the plane of movementof the armature, one in onedirection and the other in the oppositedirection, and so as to oscillate under the vibratory movement of thearmature, two stationary blocks, one in connection with the principalmagnetand the other with the main-line shunt, and a correspondingcontact for each of said blocks arranged upon vertical spindles and ireeto move up and down toward the respective blocks, the said movablecontacts in loose connection with the respective arms extending from thearmature, the said two movable contacts in connection with the mainline, substantially as described, and whereby under the movement of thearmature one of said contacts will be brought upon its block before theother c011- tact shall be lifted from its block.

2. The combination of the principal magnet and the shunt-magnet, fixedcontact-blocks E F at the shunt, the shunt-armature b, hinged to receivea vibratory movement in opening and closing, arms 0 (1, extending fromsaid armature in the plane of its vibratory move ment, and so as topartake of the movement of the armature, and contacts H and J onvertical spindles G I, and corresponding to the respective blocks E F,the said arms extending from the magnet in connection with the saidspindles, respectively, by a slot in one and corresponding pin in theother, substantially as described,and whereby under the vibratorymovement of the armature one of said contacts is permitted to fall uponand engage its block before the other contact shall be raised from itsblock, substantially 'as described.

NORMAN MCCARTY.

\Vitnesses:

H. O. BABCOCK, NonLn Iunmrrs.

